Banish mosquitos from your backyard with the Thermacell Rechargeable Mosquito Repellent in Charcoal. Featuring a rechargeable lithium-ion battery, the Thermacell Rechargeable Mosquito Repellent is your new secret weapon against itchy bites. Thermacell works by releasing a compound found in chrysanthemums called Allethrin, which is naturally repellent to mosquitos. Thermacell works best on calm days with little wind when mosquitoes are at their worst. Keep the bugs from biting this season with bug repellant from London Drugs | Rca Thermacell Radius Zone Insect Repellent Diffuser in Black